Just about anything meaty works fine. Silversides seem to be the favorite amongst most. I just feed mine little chunks of my homemade fish food, which is a mix of all sorts of things. Here are a few things I've fed to mine and would suggest. Your particular anemone may take to some more than others:
Shrimp
Any saltwater fish (I've fed Tuna, Mahi, Grouper, and Talapia)
Squid
Crab
Clam
Krill
Mysis
As with your fish, variety is a good thing, so try to feed at least a few different things. Also, it's not a bad idea to soak the food in something like Selcon or that Kent stuff. . .I think it's called Zoe or something like that. I haven't used the latter personally.